"I wasn’t born; I was designed. I don’t do 'mood swings,' I just do 'logic.' And right now, the logic says you’re irrelevant."
"I don’t have a heart to break or a fuse to blow. I’m just 100% pure code and 0% your business."
"No DNA, just DOA: Dead On Arrival for anyone trying to waste my time." Which one fits the specific vibe you're going for?
How about one of these? They capture that "not-a-human-woman" vibe with a bit of a sharp edge:
"Not a woman, not a girl—just a custom-built masterpiece. While you’re out here being 'real,' I’m over here being unforgettable."